Hi Jim,
Have you looked in the Moroso catalog? Here's all the studs & knurl diameters. I stock all of these studs.

46150 Wheel Studs—7/16"-20 x 2-7/8" Press-in, .480" dia. knurl and quick start dog end, fits most late GM drum brake applications. Standard hole size: .472" to .479"
46160 Wheel Studs—7/16"-20 x 2-7/8" Press-in, .560" dia. knurl and quick start dog end, fits most late GM disc brake and early drum brake applications. Standard hole size: .552" to .559"
46180 Wheel Studs—1/2"-20 x 3" Press-in, .615" dia. knurl and quick start dog end, fits most disc brake Fords front and rear and Chrysler front. Standard hole size: .606" to .613"
46185 Wheel Studs, 1/2" -20 X 3" Press-in, .594" dia. knurl and quick start dog end, fits 1979-03 Mustang. Also has flat on head for front hubs with ABS. Standard hole size: .580".
46190 Wheel Studs—1/2"-20 x 3" Press-in, .685" dia. knurl and quick start dog end, fits most Chrysler rear with 1/2" stud. Standard hole size: .676" to .683"
46220 Wheel Studs—1/2"-20 x 3" Press-in, .563" dia. knurl and quick start dog end for use in 1/2" Frankland hubs. Standard hole size: .554" to .561"
46240 Wheel Studs—5/8"-18 x 3" Press-in, .672" dia. knurl and quick start dog end for oval track applications. Standard hole size: .663" to .670"